I think "play" is good and should be encouraged: it helps people learn and motivates them to learn more.
If you gave each of your students their own login name and password, and set the permissions of their home directories to 700, then they could pay with their own desktops (only) as much as they like. If it ends up ugly and useless, then they'll have learnt something, and you can always reset it to the defaults.
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